docker部署后master总是会不断挂机再启动

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xf8 pc=0xc272d5]

goroutine 388 [running]:
github.com/zhenghaoz/gorse/model/ranking.GetModelName({0x0?, 0x0?})
/go/gorse/model/ranking/model.go:265 +0x95
github.com/zhenghaoz/gorse/model/ranking.(*ModelSearcher).Fit(0xc00023c7e0, 0xc000ea4fc0, 0x25?, 0xc0000e41c0, 0xc00004bde0)
/go/gorse/model/ranking/search.go:194 +0x5fa
github.com/zhenghaoz/gorse/master.(*SearchRankingModelTask).run(0xc00004bba0, 0x17deac7?)
/go/gorse/master/tasks.go:1224 +0x45c
github.com/zhenghaoz/gorse/master.(*Master).RunRagtagTasksLoop.func1({0x1db4ec0, 0xc00004bba0})
/go/gorse/master/master.go:368 +0x189
created by github.com/zhenghaoz/gorse/master.(*Master).RunRagtagTasksLoop
/go/gorse/master/master.go:364 +0x32e